.App{
  width: 750px;
  margin: auto;
  background-color: #ffffff;
  transform-origin: 0 0;
  overflow-x: hidden;
  position: relative;
}

.flex-center{
  display: flex;
  justify-content: space-around;
  align-items: center;
}

.fixed-ele{
  position: fixed;
  top: 0;
  width: 750px;
  height: 96px;
  z-index: 999;
}
.header{
  background: url(https://mat1.gtimg.com/news/images/inews/2020/feiyan/18/img/top_headv3.png) no-repeat;
  background-size: contain;
  height: 334px;
}

#news, #rumor, #prevent{
  height: 1000px;
}

.place{
  height: 100px;
}